<template>
  <div id="puzzle"
       ref="puzzle"
       style="display: inline-block">
    <div class="puzzle-container"
         :style="
        'padding:' +
        16 * scale +
        'px ' +
        16 * scale +
        'px ' +
        28 * scale +
        'px;border-radius:' +
        16 * scale +
        'px;'
      ">
      <div :style="'position:relative;overflow:hidden;width:' + dataWidth + 'px;'">
        <div :style="
            'position:relative;width:' +
            dataWidth +
            'px;height:' +
            dataHeight +
            'px;'
          ">
          <img id="scream"
               ref="scream"
               :src="imgRandom"
               :style="'width:' + dataWidth + 'px;height:' + dataHeight + 'px;'" />
          <canvas id="puzzle-box"
                  ref="puzzleBox"
                  :width="dataWidth"
                  :height="dataHeight"></canvas>
        </div>
        <div class="puzzle-lost-box"
             :style="
            'left:' +
            left_Num +
            'px;width:' +
            dataWidth +
            'px;height:' +
            dataHeight +
            'px;'
          ">
          <canvas id="puzzle-shadow"
                  ref="puzzleShadow"
                  draggable="false"
                  :width="dataWidth"
                  :height="dataHeight"></canvas>
          <canvas id="puzzle-lost"
                  ref="puzzleLost"
                  :width="dataWidth"
                  :height="dataHeight"
                  @mousedown="startMove"
                  @touchstart="startMove"></canvas>
        </div>
        <p ref="verTips"
           class="ver-tips"
           :style="
            'height: ' +
            22 * scale +
            'px;line-height:' +
            22 * scale +
            'px;bottom: ' +
            (displayTips ? 0 : -22 * scale) +
            'px;font-size: ' +
            12 * scale +
            'px;'
          ">
          <template v-if="verification">
            <span :style="'color:#42ca6b;line-height:' + 22 * scale + 'px;'">验证通过</span>
            <span></span>
          </template>
          <template v-if="!verification">
            <span :style="'color:red;line-height:' + 22 * scale + 'px;'">验证失败:</span>
            <span :style="
                'margin-left:' +
                4 * scale +
                'px;line-height:' +
                22 * scale +
                'px;'
              ">拖动滑块将悬浮图像正确拼合</span>
          </template>
        </p>
      </div>
      <div class="re-btn"
           :style="
          'height: ' +
          28 * scale +
          'px;padding: ' +
          1 * scale +
          'px ' +
          16 * scale +
          'px;font-size: ' +
          18 * scale +
          'px;'
        "
           @click="refreshImg">
        <a style="display: inline">
          <img src="@static/images/shua.png"
               style="
              font-size: 23px;
              line-height: 32px;
              width: 23px;
              display: inline-block;
              margin-top: 4px;
            " />
        </a>
      </div>
      <div class="re-btn1"
           :style="
          'height: ' +
          28 * scale +
          'px;padding: ' +
          (isOrderSearch ? 5 : 1) * scale +
          'px ' +
          16 * scale +
          'px;font-size: ' +
          18 * scale +
          'px;'
        "
           @click="closeImg">
        <a style="display: inline">
          <i class="el-icon-circle-close"
             style="font-size: 23px; line-height: 33px; color: var(--prev-color-text-primary)"></i>
        </a>
      </div>
    </div>
    <br />
    <div class="slider-container"
         :style="'width:' + dataWidth + 'px;'">
      <div class="slider-bar"
           :style="'border-radius:' + 24 * scale + 'px;'">
        <p class="slider-bar-text select-none"
           onselectstart="return false"
           :style="
            'line-height:' + 28 * scale + 'px;font-size:' + 12 * scale + 'px;'
          ">
          按住滑块， 拖动完成上方拼图
        </p>
      </div>
      <div ref="sliderBtn"
           class="slider-btn"
           :style="'top: ' + (isOrderSearch ? -14 : -17) * scale + 'px;'"
           style="font-size: 42px"
           @mousedown="startMove"
           @touchstart="startMove">
        <i style="
            font-size: 23px;
            height: 23px;
            line-height: 20px;
            width: 23px;
            border-radius: 50%;
            display: inline-block;
            background: #f97503;
            font-style: initial;
            border: 3px solid rgb(204, 204, 204);
          ">=</i>
        <!-- <img src="@/images/tou.png" style="font-size: 23px;line-height: 32px;width: 23px;display: inline-block;margin-top: 4px;"> -->
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: "Authentication",
  props: {
    width: {
      type: [String, Number],
      default: 260
    },
    height: {
      type: [String, Number],
      default: 120
    },
    cropImage: {
      type: [Boolean],
      default: false
    },
    puzzleImgList: {
      type: Array,
      default: () => [require("@static/images/ver.png")]
    },
    plSize: {
      type: [String, Number],
      default: 48
    },
    Deviation: {
      type: [String, Number],
      default: 4
    },
    padding: {
      type: [Number],
      default: 20
    },
    onSuccess: {
      type: Function,
      default: () => {
        alert("验证成功");
      }
    },
    onError: {
      type: Function,
      default: () => {
        // alert('验证失败')
      }
    },
    onSyntony: {
      type: Function,
      default: () => {
        // alert('验证')
      }
    },
    isOrderSearch: Boolean
  },
  data () {
    return {
      moveStart: "",
      displayTips: false,
      verification: false,
      randomX: null,
      randomY: null,
      imgRandom: "",
      left_Num: 0,
      dataWidth: 260,
      dataHeight: 120,
      puzzleSize: 48,
      deviation: 4,
      scale: 1,
      reTimer: null,
      isleavePage: false
    };
  },
  watch: {
    puzzleImgList: {
      handler (val) {
        if (!val.length) {
          this.refreshImg();
        } else {
          const imgRandomNum = this.RandomNum(0, val.length - 1);
          this.imgRandom = val[imgRandomNum];
        }
      },
      deep: true
    },
    imgRandom: {
      handler (val) {
        if (!val) {
          this.refreshImg();
        }
      },
      deep: true
    }
  },
  created () {
    const imgRandomNum = this.RandomNum(0, this.puzzleImgList.length - 1);
    this.imgRandom = this.puzzleImgList[imgRandomNum];
    this.puzzleSize = Number(this.plSize);
    this.deviation = Number(this.Deviation);
    this.dataWidth = this.width;
    this.dataHeight = this.height;
    this.scale = this.width / 260;
  },
  mounted () {
    const self = this;
    // this.dataWidth = this.$refs.puzzle.clientWidth * 0.884;
    this.dataWidth = 360;
    this.dataHeight = this.dataWidth * (this.height / this.width);
    this.scale = this.$refs.puzzle.clientWidth / 260;
    this.puzzleSize = this.dataWidth * (this.plSize / this.width);
    setTimeout(self.refreshImg, 0);
  },
  beforeDestroy () {
    this.isleavePage = true;
  },
  methods: {
    // 获取图片
    /* 刷新 */
    RandomNum (Min, Max) {
      const Range = Max - Min + 1;
      const Rand = Math.random();
      return Min + Math.floor(Rand * Range);
    },
    refreshImg () {
      const imgRandomNum = this.RandomNum(0, this.puzzleImgList.length - 1);
      this.imgRandom = this.puzzleImgList[imgRandomNum];
      this.initCanvas();
      this.onSyntony();
    },
    closeImg () {
      this.$emit("fatherMethod");
    },
    /* 画布初始化 */
    initCanvas () {
      this.clearCanvas();

      // let self = this
      const w = this.dataWidth;
      const h = this.dataHeight;
      // let PL_Size = 48
      // 2019-02-12开始PL_Size使用可传递参数
      const PL_Size = this.puzzleSize;
      const padding = 20;
      const MinN_X = padding + PL_Size;
      const MaxN_X = w - padding - PL_Size - PL_Size / 6;
      const MaxN_Y = padding;
      const MinN_Y = h - padding - PL_Size - PL_Size / 6;
      this.randomX = this.RandomNum(MinN_X, MaxN_X);
      this.randomY = this.RandomNum(MinN_Y, MaxN_Y);
      const X = this.randomX;
      const Y = this.randomY;
      this.left_Num = -X + 10;
      const d = PL_Size / 3;

      const c = this.$refs.puzzleBox;
      const c_l = this.$refs.puzzleLost;
      const c_s = this.$refs.puzzleShadow;
      const ctx = c.getContext("2d");
      const ctx_l = c_l.getContext("2d");
      const ctx_s = c_s.getContext("2d");
      ctx.globalCompositeOperation = "xor";
      ctx.shadowBlur = 10;
      ctx.shadowColor = "var(--prev-bg-white)";
      ctx.shadowOffsetX = 3;
      ctx.shadowOffsetY = 3;
      ctx.fillStyle = "rgba(0,0,0,0.7)";
      ctx.beginPath();
      ctx.lineWidth = "1";
      ctx.strokeStyle = "rgba(0,0,0,0)";
      ctx.moveTo(X, Y);
      ctx.lineTo(X + d, Y);
      ctx.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y);
      ctx.lineTo(X + 3 * d, Y);
      ctx.lineTo(X + 3 * d, Y + d);
      ctx.bezierCurveTo(
        X + 2 * d,
        Y + d,
        X + 2 * d,
        Y + 2 * d,
        X + 3 * d,
        Y + 2 * d
      );
      ctx.lineTo(X + 3 * d, Y + 3 * d);
      ctx.lineTo(X, Y + 3 * d);
      ctx.closePath();
      ctx.stroke();
      ctx.fill();

      const img = new Image();
      img.src = this.imgRandom;
      img.onload = function () {
        ctx_l.beginPath();
        ctx_l.strokeStyle = "rgba(0,0,0,0)";
        ctx_l.moveTo(X, Y);
        ctx_l.lineTo(X + d, Y);
        ctx_l.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y);
        ctx_l.lineTo(X + 3 * d, Y);
        ctx_l.lineTo(X + 3 * d, Y + d);
        ctx_l.bezierCurveTo(
          X + 2 * d,
          Y + d,
          X + 2 * d,
          Y + 2 * d,
          X + 3 * d,
          Y + 2 * d
        );
        ctx_l.lineTo(X + 3 * d, Y + 3 * d);
        ctx_l.lineTo(X, Y + 3 * d);
        ctx_l.closePath();
        ctx_l.stroke();
        ctx_l.shadowBlur = 10;
        ctx_l.shadowColor = "black";
        ctx_l.clip();
        ctx_l.drawImage(img, 0, 0, w, h);
      };
      ctx_s.beginPath();
      ctx_s.lineWidth = "1";
      ctx_s.strokeStyle = "rgba(0,0,0,0)";
      ctx_s.moveTo(X, Y);
      ctx_s.lineTo(X + d, Y);
      ctx_s.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y);
      ctx_s.lineTo(X + 3 * d, Y);
      ctx_s.lineTo(X + 3 * d, Y + d);
      ctx_s.bezierCurveTo(
        X + 2 * d,
        Y + d,
        X + 2 * d,
        Y + 2 * d,
        X + 3 * d,
        Y + 2 * d
      );
      ctx_s.lineTo(X + 3 * d, Y + 3 * d);
      ctx_s.lineTo(X, Y + 3 * d);
      ctx_s.closePath();
      ctx_s.stroke();
      ctx_s.shadowBlur = 20;
      ctx_s.shadowColor = "black";
      ctx_s.fill();
    },
    /* 通过重置画布尺寸清空画布，这种方式更彻底 */
    clearCanvas () {
      const c = this.$refs.puzzleBox;
      const c_l = this.$refs.puzzleLost;
      const c_s = this.$refs.puzzleShadow;
      c.setAttribute("height", c.getAttribute("height"));
      c_l.setAttribute("height", c.getAttribute("height"));
      c_s.setAttribute("height", c.getAttribute("height"));
      // c.height = c.height
      // c_l.height = c_l.height
      // c_s.height = c_s.height
    },
    /* 按住滑块后初始化移动监听，记录初始位置 */
    startMove (e) {
      e = e || window.event;
      this.$refs.sliderBtn.style.backgroundPosition = "0 -216px";
      this.moveStart = e.pageX || e.targetTouches[0].pageX;
      this.addMouseMoveListener();
    },
    /* 滑块移动 */
    moving (e) {
      const self = this;
      e = e || window.event;
      const moveX = e.pageX || e.targetTouches[0].pageX;
      const d = moveX - self.moveStart;
      const w = self.dataWidth;
      const PL_Size = this.puzzleSize;
      const padding = 20;
      if (self.moveStart === "") {
        return "";
      }
      if (d < 0 || d > w - padding - PL_Size) {
        return "";
      }
      self.$refs.sliderBtn.style.left = d + "px";
      self.$refs.sliderBtn.style.transition = "inherit";
      self.$refs.puzzleLost.style.left = d + "px";
      self.$refs.puzzleLost.style.transition = "inherit";
      self.$refs.puzzleShadow.style.left = d + "px";
      self.$refs.puzzleShadow.style.transition = "inherit";
    },
    /* 移动结束，验证并回调 */
    moveEnd (e) {
      const self = this;
      e = e || window.event;
      const moveEnd_X = (e.pageX || e.changedTouches[0].pageX) - self.moveStart;
      const ver_Num = self.randomX - 10;
      const deviation = this.deviation;
      const Min_left = ver_Num - deviation;
      const Max_left = ver_Num + deviation;
      if (self.moveStart !== "") {
        if (Max_left > moveEnd_X && moveEnd_X > Min_left) {
          self.displayTips = true;
          self.verification = true;
          setTimeout(function () {
            if (self.isleavePage) {
              return;
            }
            self.displayTips = false;
            self.initCanvas();
          }, 1000);
          /* 成功的回调函数 */
          self.onSuccess();
        } else {
          self.displayTips = true;
          self.verification = false;
          this.refreshImg();
          setTimeout(function () {
            if (self.isleavePage) {
              return;
            }
            self.displayTips = false;
          }, 2000);
          /* 失败的回调函数 */
          self.onError();
        }
      }
      if (
        typeof self.$refs.sliderBtn !== "undefined" &&
        typeof self.$refs.puzzleLost !== "undefined" &&
        typeof self.$refs.puzzleShadow !== "undefined"
      ) {
        self.reTimer = setTimeout(function () {
          if (self.isleavePage) {
            return;
          }
          self.$refs.sliderBtn.style.left = 0;
          self.$refs.sliderBtn.style.transition = "left 0.5s";
          self.$refs.puzzleLost.style.left = 0;
          self.$refs.puzzleLost.style.transition = "left 0.5s";
          self.$refs.puzzleShadow.style.left = 0;
          self.$refs.puzzleShadow.style.transition = "left 0.5s";
        }, 1000);
        self.$refs.sliderBtn.style.backgroundPosition = "0 -84px";
      }
      self.moveStart = "";
    },
    /* 全局绑定滑块移动与滑动结束，移动过程中鼠标可在页面任何位置 */
    addMouseMoveListener () {
      const self = this;
      document.addEventListener("mousemove", self.moving);
      document.addEventListener("touchmove", self.moving);
      document.addEventListener("mouseup", self.moveEnd);
      document.addEventListener("touchend", self.moveEnd);
    }
  }
};
</script>

<style scoped>
.slider-btn {
  position: absolute;
  width: 44px;
  height: 44px;
  left: 0;
  top: -7px;
  z-index: 12;
  cursor: pointer;
  background-position: 0 -84px;
  transition: inherit;
  padding-top: 4px;
}
.ver-tips {
  position: absolute;
  left: 0;
  bottom: -22px;
  background: rgba(255, 255, 255, 0.9);
  height: 22px;
  line-height: 22px;
  font-size: 12px;
  width: 100%;
  margin: 0;
  text-align: left;
  padding: 0 8px;
  transition: all 0.4s;
}
.slider-tips {
  bottom: 0;
}
.ver-tips i {
  display: inline-block;
  width: 22px;
  height: 22px;
  vertical-align: top;
  background-position: -4px -1229px;
}
.ver-tips span {
  display: inline-block;
  vertical-align: top;
  line-height: 22px;
  color: #455;
}
.active-tips {
  display: block;
}
.hidden {
  display: none;
}
.re-btn {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 28px;
  padding: 0 16px;
  line-height: 28px;
}
.re-btn1 {
  position: absolute;
  left: 40px;
  bottom: 0;
  height: 28px;
  padding: 0 16px;
  line-height: 32px;
}
.re-btn a {
  display: inline-block;
  width: 14px;
  height: 14px;
  margin: 7px 0;
  background-position: 0 -1179px;
  cursor: pointer;
}
.re-btn a:hover {
  background-position: 0 -1193px;
}
.re-btn1 a {
  display: inline-block;
  width: 14px;
  height: 14px;
  margin: 7px 0;
  background-position: 0 -1179px;
  cursor: pointer;
}
.re-btn1 a:hover {
  background-position: 0 -1193px;
}

.puzzle-container {
  position: relative;
  padding: 16px 16px 28px;
  border: 1px solid var(--prev-border-color-extra-grey);
  background: #f2ece1;
  border-radius: 16px;
}
.slider-container {
  position: relative;
  margin: auto;
}
.slider-bar {
  border: 1px solid #c3c3c3;
  border-radius: 24px;
  background: #ece4dd;
  box-shadow: 0 1px 1px rgba(12, 10, 10, 0.2) inset;
}
.slider-bar-text {
  font-size: 12px;
  color: #486c80;
  /* height: 40px;
  line-height: 40px; */
  margin: 0;
  text-align: center;
  /* padding-left: 84px; */
}

#puzzle-box {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 22;
}
#puzzle-shadow {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 22;
}
#puzzle-lost {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 33;
}
.puzzle-lost-box {
  position: absolute;
  width: 260px;
  height: 116px;
  left: 0;
  top: 0;
  z-index: 111;
}
</style>
